Add CI workflow to build book PDF and diff on PRs - #25
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Adds a GitHub Actions workflow that, on every PR against `main`: - builds the book PDF from the PR branch and from the base branch (both with `mystmd`'s `plain_latex_book` template, pinned to sidestep the Typst export's issue with `**X**yz` bold markdown patterns), - runs `diff-pdf` inside the ghcr.io/stamped-principles/diff-pdf container to produce a full diff PDF plus per-page 3-panel montages, - pushes both PDFs and the per-page images to a per-PR orphan branch `gh-pages-pr-<N>` so reviewers can browse them via raw.github links from the PR conversation, and - posts (and updates) a single PR comment linking the artifacts and summarizing changed / unchanged / added / removed pages. A companion `cleanup-pr-preview.yml` deletes the orphan branch when the PR is closed. Modeled on stamped-principles/stamped-paper's build-pdf.yml pattern; adapted for this repo by building the base PDF locally (this repo does not publish the PDF to Pages). Co-Authored-By: Claude Code 2.1.204 / Claude Opus 4.7 <noreply@anthropic.com>
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Adds
.github/workflows/build-pdf.yml,cleanup-pr-preview.yml, and.github/scripts/diff-book-pdf.sh. Modeled on the stamped-principles/stamped-paper pattern; builds base PDF locally rather than fetching from a Pages URL. Enables reviewer preview + page-by-page diff on every PR.likely might need fixups etc... just thought to run idea by first. See example stamped-principles/stamped-paper#183 (comment) besides that diff previews no longer available since upon merge we remove the branch which contains all those individual pages diffs... I can later prepare a PR which demonstrates it there